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Java Collections reverseOrder() Method

The reverseOrder() is a Java Collections class method which returns a comparator that imposes the reverse of the natural ordering on the objects. There is two different types of Java reverseOrder() method which can be differentiated depending on its parameter. These are:

  1. Java Collections reverseOrder() Method
  2. Java Collections reverseOrder(comp) Method

Java Collections reverseOrder() Method

The reverseOrder() method of Java Collections class is used to get the comparator that imposes the reverse of the natural ordering on a collection of objects which implement the Comparable interface.

Java Collections reverseOrder(comp) Method

The reverseOrder() method of Java Collections class is used to get the comparator that imposes the reverse ordering of the specified comparator.

Syntax

Following is the declaration of reverseOrder() method:

Parameter

Parameter Description Required/Optional
comp It is a comparator whose ordering is to be reversed by the returned comparator or null. Required

Returns

Method Returns
reverseOrder() It returns a comparator that imposes the reverse natural ordering on a collection of objects that implement the Comparable interface.
reverseOrder(Comparator comp) It returns a comparator that imposes the reverse ordering of the specified comparator.

Exceptions

NA

Compatibility Version

Java 1.5 and above

Example 1

Test it Now

Output:

List sorted in ReverseOrder: 
[90, 50, 10, -15, -20]

Example 2

Test it Now

Output:

List sorted in ReverseOrder: 
[Ruby, Python, Java, COBOL]

Example 3

Test it Now

Output:

[Ruby, Commit, Pratham, Jaya]

Example 4

Test it Now

Output:

List sorted in ReverseOrder: 
120 
50 
-20 
-80 





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